Bubble Shooter Record

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Server will find an opponent based on your current Rank and Skill level.

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🎯 MATCH FOUND!

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Documentation

Rank & skill

Skill score

Every replay is analyzed through SkillEngine from actionDataList, producing a rating between 0.0 and 1.0.

Tempo = total actions ÷ match duration (minutes), floored at 0.1 min.
Skill score = min(Tempo ÷ 60, 1.0).

Matchmaking uses the average of the 5 most recent eligible replays. New players default to 0.2.

Matchmaking

On POST /recommend, the server picks an opponent in three passes:

DB filter — up to 50 records within ±500 rank, not recently used (MAX_USAGE_HISTORY), and satisfies: true.
Scoring — MatchmakingEngine finds the lowest distance, then randomly picks among candidates within MATCH_RANDOM_EPSILON of that best score (0 = strict best only).
Fallback — relax constraints if no candidate fits.

Distance

Distance = W1 × |Rank_A − Rank_B|

Guardrails

Never match against your own replays.
Skip recently used opponent records.
Avoid last opponent when possible.

Rank (Elo) updates

After POST /result, if you had an opponent from the last match, RankEngine updates rank:

NewRank = max(0, OldRank + EloDelta + round(SkillBonus))

EloDelta = round(K_FACTOR × (Outcome − Expected))

SkillBonus = SKILL_BONUS_COEFF × (YourSkill − OpponentSkill)

Outcome: 1 win, 0 loss, 0.5 draw (by score comparison).

Save rules

RecordQualificationService checks three thresholds — values must be strictly above the limit:

RECORD_MIN_SCORE
RECORD_MIN_FIRE_BUBBLE_COUNT
RECORD_MIN_PLAY_TIME_SEC

Pass → satisfies: true (eligible for matchmaking). Fail → replay is still saved with satisfies: false. Rank still updates if there was a prior opponent.

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